摘要:

Based on Tresca's yield condition and its associated flow rule, the elastic-plastic deformation of a heat-generating tube with free ends is investigated by taking into consideration the influence of the temperature dependence of the yield stress. It is found that the expansion of the inner plastic zones as well as the stress state are affected markedly owing to the reduction in the yield stress at elevated temperatures. The stress distribution and the expansion of different plastic regions are displayed graphically and discussed.

ISSN:0149-5739    

DOI:10.1080/01495730050143125

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

The results of an analytical study of the nonlinear response of flat and curved panels subjected to pre-existing, nondestabilizing lateral pressure and thermal loads and to mechanical edge loads are presented. The mechanical loads include uniaxial compression loads and combinations of uniaxial compression and transverse tension or compression loads that are increased monotonically into the postbuckling response range of the panels. The structural model used to analyze the panels is based on a higher order shell theory that includes transverse-shear flexibility, initial geometric imperfections, and von Karman_type geometric nonlinearities. The edges of a panel are modeled as simply supported edges with the displacement normal to the edge face either unrestrained or fully restrained. Results are presented for transversely isotropic single-layer panels and three-layer sandwich panels that illustrate how the temperature field, initial imperfections, lateral pressure loads, and mechanical edge loads interact to change the character of the nonlinear panel response. Some response curves are presented that have classic unstable, asymmetric bifurcation behavior and intense snap-through instabilities. Other results show that, for some cases, these interactions can reduce the intensity of snap-through instabilities and even eliminate this form of instability altogether for certain ranges of loading and structural parameters. In addition, results are presented that show how transverse-shear flexibility affects the interactions of the temperature field, the initial imperfections, the lateral pressure loads, and, thus, the character of the nonlinear panel response. One important finding of the present study is that linear bifurcation buckling analyses may not indicate adequately the onset of significant nonlinear deformations of a geometrically perfect, shallow curved panel for certain combined mechanical loading conditions. This finding may affect current preliminary design practice.

ISSN:0149-5739    

DOI:10.1080/01495730050143134

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

Maysel's formula is applied to a thin circular plate under axisymmetric thermal or piezoelectric loading. The plate may be traction-free, simply supported, or clamped on its cylindrical boundary. Solutions are obtained in the form of Fourier-Bessel series. Numerical results for displacements and stresses are presented, corresponding to various loading distributions and plate thickness-to-diameter ratios.

ISSN:0149-5739    

DOI:10.1080/01495730050143143

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

摘要:

This article deals with the diffusion model of the linear theory of binary mixtures of the thermoelastic solids. A wide class of external (with respect to an unbounded domain) boundary value problems of steady oscillations is investigated using the potential method. Sommerfeld-Kupradze-type radiation conditions are established. The uniqueness and existence theorems of classical solutions of the aforementioned problems are proved.

ISSN:0149-5739    

DOI:10.1080/01495730050143152

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor

ISSN:0149-5739    

DOI:10.1080/01495730050143161

出版商:Informa UK Ltd    

年代:2000

数据来源: Taylor